Impressionist music usually features a. clear meter. b. traditional rhythms. c. a concrete mood or atmosphere. d. more than one instrument

B must be the answer

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"